Kohler Generator LOP Error Code Explained: Meaning, Causes & Fixes

 

Understanding and Fixing the LOP Error on a Kohler Generator

 

The LOP error on a Kohler generator stands for "Low Oil Pressure." This means the generator's internal sensors have detected that the oil pressure is below the safe operating range. Low oil pressure can lead to severe engine damage, so the generator automatically shuts down or refuses to start until the issue is resolved. If you're in St Louis or Nashville, proper diagnosis and resolution of this error is crucial to keep your home or business protected during power outages.

 

Immediate Steps to Take When You See an LOP Error

 

• Turn Off the Generator: As soon as you see the LOP error, switch off your Kohler generator. Avoid trying to restart it until you have checked and corrected the problem. Running the engine with low oil pressure can cause permanent damage.

 

Checking Oil Level and Condition

 

• Locate the Oil Dipstick: Open the generator’s access panel. Find the oil dipstick—it looks similar to those in cars and usually has a bright colored or labeled handle.
• Check the Oil Level: Pull out the dipstick, wipe it clean, insert it all the way, then pull it out again. Look at the oil on the dipstick to see where it reaches relative to the “Full” and “Add” marks. If it’s low, add manufacturer-recommended oil until you reach the proper level.
• Inspect Oil Quality: Good engine oil should look amber or brownish, but not milky, gritty, or sludge-like. If the oil is dirty or contaminated, perform a complete oil change following Kohler’s guidelines.

 

Checking and Replacing the Oil Filter

 

• Locate the Oil Filter: Refer to your generator's manual to find the oil filter location. A clogged or dirty oil filter can cause low oil pressure.
• Replace the Oil Filter if Necessary: If the filter appears old or dirty, replace it with a new one that matches Kohler’s specifications for your particular model.

 

Inspecting for Oil Leaks and Blockages

 

• Look Under and Around the Generator: Check for visible oil puddles, wet spots, or stains beneath the generator or on the unit. Oil leaks should be fixed promptly to avoid ongoing loss of oil (and pressure).
• Check Oil Lines and Gaskets: Look closely at hoses, fittings, and gasketed areas for signs of oil seepage or damage.
• Clear Blockages: Sometimes oil passages inside the engine can become blocked with sludge or debris. If there’s evidence of contamination and you have experience, you can try flushing the system, but in most cases, calling a qualified technician from St Louis or Nashville is the safest option for deeper internal issues.

 

Checking the Oil Pressure Sensor or Switch

 

• Locate the Oil Pressure Sensor: This is a small electronic device screwed into the engine block and wired into the generator’s controls. It monitors the oil pressure and triggers the LOP warning if pressure is too low.
• Inspect for Loose or Damaged Wires: Make sure the sensor’s connectors are tightly in place and not corroded or broken.
• Test or Replace the Sensor: Sometimes the sensor itself fails, even if oil level and pressure are fine. If all other steps are good and the error persists, the sensor may need replacement.

 

Restarting the Generator After Fixes

 

• After refilling oil, replacing filters, correcting leaks, and checking the sensor, reset the generator’s controller if needed (often this involves holding the “Reset” or “Off/Reset” button for a few seconds, but check your Kohler manual for specifics).
• Try restarting the generator. Watch for the LOP error. If it clears and the unit runs smoothly, monitor for several minutes to confirm the problem is solved.
• If the LOP fault shows up again, do not force the unit to run—this can indicate a deeper engine issue (such as an oil pump failure or a worn-out internal engine part). At this point, it’s essential to contact a generator specialist in St Louis or Nashville.

 

Regular Maintenance to Prevent LOP Errors

 

• Change oil and filter at intervals suggested by Kohler—often every 100-200 hours of use or annually, whichever comes first.
• Inspect for leaks and check oil levels monthly if your generator is used for standby power.
• Make sure your generator is positioned on a level surface; if it’s tilted, oil may not flow correctly and could cause low pressure readings.
• If in doubt, or if you’re not comfortable with maintenance, schedule professional service in St Louis or Nashville to keep the generator running reliably.

 

The LOP error on a Kohler generator is a safety mechanism to prevent engine damage. Most often, it's caused by low oil level, dirty oil, a failing sensor, or an oil leak. Once you check and correct these issues, the generator should reset. If not, expert help from a local technician is the safest way to prevent further problems and keep your backup power system dependable.